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| Titel |
A fine fraction of soil used as an aerosol analogue during the DUNE experiment: sequential solubility in water, decreasing pH step-by-step |
| VerfasserIn |
C. Aghnatios, R. Losno, F. Dulac |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 11, no. 17 ; Nr. 11, no. 17 (2014-09-02), S.4627-4633 |
| Datensatznummer |
250117572
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| Publikation (Nr.) |
 copernicus.org/bg-11-4627-2014.pdf |
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| Zusammenfassung |
| A soil sample collected in a desert aerosol source area near Douz (southern
Tunisia) was dry-sieved at 20 μm in order to extract the fraction
similar to a wind-generated aerosol, and was used to seed mesocosms during
the DUNE experiment (a DUst experiment in a low Nutrient, low chlorophyll Ecosystem). In this work, said "aerosol-like" fine dust was
sequentially leached by short contacts with water at initial pHs, decreasing
from seven to one, representing various wet environmental conditions. For
each step, the solubility of a given element is calculated as the amount of
its dissolved fraction, relative to its total amount. The evolution of this
fractional solubility from the highest to lowest pHs provides information on
the chemical strength needed to solubilise a given element and its lability.
The behaviour of the elemental solubility was sorted into two groups: (1) Ca,
Sr, Ba, Mn, and P, with a solubility between 23% and
70%, and a maximum sequential solubility at pH 3; (2) Al and Fe, with a solubility of less than 2% and the highest release
at pH 1. Similar solubility patterns in group 1 for Ca, P, and Mn suggest a
possible association of the elements in the same minerals, most probably
carbonates. |
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